Sonuç olarak bu çalışmada, farklı aralayıcı uzunluklarına (n = 6 ve 8) sahip mezojenik birim içeren ve içermeyen bazı makromoleküller hazırlandı.
Hazırlanan bileşiklerin yapıları 1
H, 13C, APT, COSY NMR, FT-IR ve elementel analiz gibi analiz teknikleri kullanılarak aydınlatıldı.
Sıvı kristal özellik gösteren bileşiklerin faz dokuları, türleri ve geçişleri POM aracılığıyla belirlendi. DSC analizi de faz geçiş sıcaklıklarını ve ilgili geçiş entalpilerini belirleyerek sonuçları destekledi.
Hazırlanan bileşiklerde yapı-özellik ilişkileri incelenerek, sentez basamaklarında bir takım değişikler yapılarak sıvı kristal özelliklere ulaşılmaya çalışıldı.
Sentezlenen bileşiklerden ve yapılan analiz sonuçlarından, taç eter grubunun bifenil ve p-kuaterfenil birimine bağlanmasıyla, yapısal olarak molekülün genişliğini beklenenden fazla arttırarak ve konjüge fenil sisteminin rijitliğini etkileyerek, sıvı kristal oluşumunu engellediği anlaşıldı. Taç eter ihtiva eden moleküllerde mezojenik grup bulunması veya bulunmamasının sıvı kristal faz oluşumunu etkilemediği tespit edildi.
p-Kuaterfenil taç eter türevlerinde, konjüge fenil sistemine yandan elektron verici metil grubu ve elektron çekici flor sübstitüentleri bağlandı. Flor sübstitüenti moleküllerin nematik geçiş ve berraklaşma noktalarını düşürücü etki yaptığı bilinmektedir. Sentezlenen bileşikler sıvı kristal özellik sergilemediğinden, bu grupları etkisi incelenemedi. Ancak flor atomu diğer gruplar ile etkileşime girerek
1
H NMR ve FT-IR spektrumlarında bazı farklılıklar meydana getirdi.
p-Kuaterfenil taç eter türevlerinin bazı metal tuzları ile kararlı katı kompleksleri hazırlanmak istendi, ancak sadece 11d ve Hg(SCN)2 arasında kararlı kompleks elde
edilebildi. Kompleksin oluşumu 1H NMR ve FT-IR spektrumlarındaki farklılaşmalar ile doğrulandı. İlaveten, POM ve DSC analizlerinden kompleksin sıvı kristal özellik göstermediği görüldü.
Dimerik siyanobifenil türevlerinin Schlieren, ipliksi ve damla dokuları ile monotropik nematik faz sergilediği belirlendi.
Trimerik siyanobifenil türevleri, klasik lineer mezojenik moleküllere göre oldukça farklı davranışlar sergiledi. Trimerik yapının oluşmasıyla birlikte mezofaz aralığı yaklaşık 4-5 kat arttı. Termogravimetrik analiz trimerik siyanobifenillerin hem mezofaz aralığında ve hem de berraklaşma noktasının yaklaşık 209 oC üzerine
kadar termal olarak kararlığı olduğu gösterdi.
Sentezlenen bazı bileşiklerin sıvı kristal özellik göstermemesine rağmen, bazı bileşiklerden ilginç sonuçlar elde edilmesi bu alanda yapılacak bilimsel çalışmalara katkıda bulunacaktır.
Sıvı kristallerin yeni özellikleri ve türleri araştırıldığından dolayı, bu malzemeler endüstri ve bilimsel uygulamalarda önem arz etmektedir.
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